EUDI Verifier Backend

Based on the EU reference implementation with commit 1ba6ccc186fb2f1b8c9beeb119142def1c71121e

See https://github.com/eu-digital-identity-wallet/eudi-srv-web-verifier-endpoint-23220-4-kt/commit/1ba6ccc186fb2f1b8c9beeb119142def1c71121e

Fixes added for conformance test

• Add support for x5c header in sd-jwt signature validation

Changes made in phase 2:

• Add verifier attestation
• Add support for multiple credentials in result
• Allow overriding clientid scheme and clientid from presentation request creation

Changes made in phase 1:

• Added signature and authenticated channel checks for credentials in credential response validation